package com.example.park_management.service;

import okhttp3.*;
import org.json.JSONObject;
import org.springframework.stereotype.Service;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Base64;

@Service
public class CarService_lh {

    public static final String API_KEY = "KLzlI717fqeOFsG1CqFL2i7X";
    public static final String SECRET_KEY = "QjPui56tRqDlnOXmaIMMAVr9Ta5xkXdZ";

    static final OkHttpClient HTTP_CLIENT = new OkHttpClient().newBuilder().build();

    public String get(InputStream inputStream) throws Exception {
        MediaType mediaType = MediaType.parse("application/x-www-form-urlencoded");
        // image 可以通过 getFileContentAsBase64("C:\fakepath\微信截图_20231208222636.png") 方法获取,如果Content-Type是application/x-www-form-urlencoded时,第二个参数传true
        RequestBody body = RequestBody.create(mediaType, "image=" + inputStream2Base64(inputStream) + "&multi_detect=false&multi_scale=false");
        Request request = new Request.Builder()
                .url("https://aip.baidubce.com/rest/2.0/ocr/v1/license_plate?access_token=" + getAccessToken())
                .method("POST", body)
                .addHeader("Content-Type", "application/x-www-form-urlencoded")
                .addHeader("Accept", "application/json")
                .build();
        Response response = HTTP_CLIENT.newCall(request).execute();
        JSONObject jsonObject = new JSONObject(response.body().string());


        String number = jsonObject.getJSONObject("words_result").getString("number");


        return " 车牌号：" + number;
    }

    /**
     * 获取文件base64编码
     *
     * @param path      文件路径
     * @param urlEncode 如果Content-Type是application/x-www-form-urlencoded时,传true
     * @return base64编码信息，不带文件头
     * @throws IOException IO异常
     */
    static String getFileContentAsBase64(String path, boolean urlEncode) throws IOException {
        byte[] b = Files.readAllBytes(Paths.get(path));
        String base64 = Base64.getEncoder().encodeToString(b);
        if (urlEncode) {
            base64 = URLEncoder.encode(base64, "utf-8");
        }
        return base64;
    }


    /**
     * 从用户的AK，SK生成鉴权签名（Access Token）
     *
     * @return 鉴权签名（Access Token）
     * @throws IOException IO异常
     */
    static String getAccessToken() throws Exception {
        MediaType mediaType = MediaType.parse("application/x-www-form-urlencoded");
        RequestBody body = RequestBody.create(mediaType, "grant_type=client_credentials&client_id=" + API_KEY
                + "&client_secret=" + SECRET_KEY);
        Request request = new Request.Builder()
                .url("https://aip.baidubce.com/oauth/2.0/token")
                .method("POST", body)
                .addHeader("Content-Type", "application/x-www-form-urlencoded")
                .build();
        Response response = HTTP_CLIENT.newCall(request).execute();
        return new JSONObject(response.body().string()).getString("access_token");
    }

    private static String inputStream2Base64(InputStream is) throws Exception {
        byte[] data = null;
        try {
            ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
            byte[] buff = new byte[100];
            int rc = 0;
            while ((rc = is.read(buff, 0, 100)) > 0) {
                swapStream.write(buff, 0, rc);
            }
            data = swapStream.toByteArray();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (IOException e) {
                    throw new Exception("输入流关闭异常");
                }
            }
        }

        return URLEncoder.encode(Base64.getEncoder().encodeToString(data), "utf-8");


    }
}


